单词	permutation
释义	Permutation Any of the ways we can arrange things, where the order is important. Example: You want to visit the homes of three friends Alex ("a"), Betty ("b") and Chandra ("c"), but haven't decided in what order. What choices do you have? Answer: {a,b,c} {a,c,b} {b,a,c} {b,c,a} {c,a,b} {c,b,a} When the order does not matter, such as in a fruit salad, it is a Combination. See: Combination
随便看	finite number first flat flip fluid ounce focus foil method foot force formula fortnight four color theorem fourier series fractal fraction fraction bar fraud frequency frequency distribution frequency histogram frequency polygon frequency table frequently frustum function

数学辞典收录了1200条数学词条，基本涵盖了常用数学知识及数学英语单词词组的翻译及用法，是数学学习的有利工具。